package com.ykl.cas.utils;

public class CheckUrlUtils {
  public static boolean isURL(String str) {

//转换为小写
    str = str.toLowerCase();
    String regex = "^((https|http|ftp|rtsp|mms)?://)"  //https、http、ftp、rtsp、mms

            + "?(([0-9a-z_!~*‘().&=+$%-]+: )?[0-9a-z_!~*‘().&=+$%-]+@)?" //ftp的user@

            + "(([0-9]{1,3}\\.){3}[0-9]{1,3}" // IP形式的URL- 例如：199.194.52.184

            + "|" // 允许IP和DOMAIN(域名)

            + "([0-9a-z_!~*‘()-]+\\.)*" // 域名- www.

            + "([0-9a-z][0-9a-z-]{0,61})?[0-9a-z]\\." // 二级域名

            + "[a-z]{2,6})" // first level domain- .com or .museum

            + "(:[0-9]{1,5})?" // 端口号最大为65535,5位数

            + "((/?)|" // a slash isn‘t required if there is no file name

            + "(/[0-9a-z_!~*‘().;?:@&=+$,%#-]+)+/?)$";

    return str.matches(regex);

  }

}
